problem with example inverse distance weighted (IDW) interpolation

[...]

Now it comes up, I'm curious why, as spatstat suggests, one would want

to interpolate point pattern marks. As there are no marks where there
are no points, how should the interpolated values be understood? Or is
this intended to be done outside the observation window?

If you deal with multivariate point patterns 
maybe you could find useful considering the 
effects of the marks of one type of points over points of the other types...

Cheers,

Marcelino

--
Edzer Pebesma
Institute for Geoinformatics (ifgi), University of M?nster
Weseler Stra?e 253, 48151 M?nster, Germany. Phone: +49 251
8333081, Fax: +49 251 8339763  http://ifgi.uni-muenster.de
http://www.52north.org/geostatistics      e.pebesma at wwu.de

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___________________________________________________

Marcelino de la Cruz Rot
Departamento de Biolog?a y Geolog?a
Escuela Superior de Ciencias Experimentales y Tecnolog?a
Universidad Rey Juan Carlos
c/ Tulip?n, s/n.
E-28933 M?stoles (Madrid)
Espa?a
Fax: +34 91 664 7490